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Exzap 2022-08-22 22:21:23 +02:00
parent e3db07a16a
commit d60742f52b
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69
src/util/MemMapper/MemMapperUnix.cpp Normal file
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#include "util/MemMapper/MemMapper.h"
#if BOOST_OS_LINUX > 0
#include <unistd.h>
#include <sys/mman.h>
namespace MemMapper
{
const size_t sPageSize{ []()
{
return (size_t)getpagesize();
}()
};
size_t GetPageSize()
{
return sPageSize;
}
int GetProt(PAGE_PERMISSION permissionFlags)
{
int p = 0;
if (HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_READ) && HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_WRITE) && HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_EXECUTE))
p = PROT_READ | PROT_WRITE | PROT_EXEC;
else if (HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_READ) && HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_WRITE) && !HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_EXECUTE))
p = PROT_READ | PROT_WRITE;
else if (HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_READ) && !HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_WRITE) && !HAS_FLAG(permissionFlags, PAGE_PERMISSION::P_EXECUTE))
p = PROT_READ;
else
cemu_assert_unimplemented();
return p;
}
void* ReserveMemory(void* baseAddr, size_t size, PAGE_PERMISSION permissionFlags)
{
return mmap(baseAddr, size, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
}
void FreeReservation(void* baseAddr, size_t size)
{
munmap(baseAddr, size);
}
void* AllocateMemory(void* baseAddr, size_t size, PAGE_PERMISSION permissionFlags, bool fromReservation)
{
void* r;
if(fromReservation)
{
if( mprotect(baseAddr, size, GetProt(permissionFlags)) == 0 )
r = baseAddr;
else
r = nullptr;
}
else
r = mmap(baseAddr, size, GetProt(permissionFlags), MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
return r;
}
void FreeMemory(void* baseAddr, size_t size, bool fromReservation)
{
if (fromReservation)
mprotect(baseAddr, size, PROT_NONE);
else
munmap(baseAddr, size);
}
};
#endif